Autolinker does not support paths with colons in scheme-less URLs

[threema-johann]

URLs containing version numbers or tags, similar to those used for Docker registry or image references, are incorrectly parsed.

How to reproduce:

1. Go to http://greg-jacobs.com/Autolinker.js/examples/live-example/
2. Add "sub.domain.org/path/pre:after-1.2" as input

=> sub.domain.org/path/pre:after-1.2pre:after-1.2pre:after-1.2